Phosphating solution for metal substrates

Details Phosphating solution for metal substrates Phosphating solution for metal substrates

1993-04-07

1996-01-09

Bell, Janyce

Coating processes

With post-treatment of coating or coating material

Heating or drying

148253, 148261, 148262, 148268, 427409, 4274191, 427435, B05D 302

Patent

active

054827469

ABSTRACT:
This invention relates to conversion coating of metal substrates which may comprise mixed metals such as steel, zinc or zinc based alloys or zinc aluminium alloy coated steel, aluminium or aluminium surfaces to provide a corrosion resistant surface which is subsequently coated with a paint coating.
The process of the invention comprises contacting the metal surface with an aqueous composition comprising silica, phosphoric acid and a divalent metal ion, the composition being substantially free of chromium and of any oxy metal anions which the metal has a valency of at least 5. The metal surface is subsequently cured by drying, or preferably by heating immediately after contact with the composition with no intermediate rinsing stage. A paint coating is then applied.
The process provides a painted surface, the coating providing an effective anti-corrosion coating and paint having good adhesion.

REFERENCES:
patent: 4120702 (1978-10-01), Akerblom
patent: 4130431 (1978-12-01), Kogure
patent: 4881975 (1989-11-01), Collier et al.
patent: 5135583 (1992-08-01), Gehmecker et al.
patent: 5242714 (1993-09-01), Steele
Favilla J. R.--"No Rinse Treatment for Aluminium"--Product Finishing, 1990 (11): 45-55 (no month).

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